Post-Construction Considerations

EMF problems are most frequently discovered after a building is remodeled or built out, or when space that was previously unused is converted to office space. When a problem emerges, keep these tips in mind:

• Identify the source of the problem and the strength of the fields. Most likely the source will be a high-current carrying device such as a transformer, electric service panel or conduit.
• Frequently your local electric utility can assist you with low or no-cost preliminary surveys. Professional surveys will be more extensive and to get the most for your money, make sure that the company you hire provides a mitigation plan and a guarantee of performance.
• Many times the simplest approach is to increase the distance between the source and the affected devices, usually computer monitors and equipment. If space is not a high commodity, then the area immediately adjacent to the source can be downgraded to storage or low tech use. However, if the affected space is in a high demand location, you will want to consider shielding to preserve the value and utility of the space.
• If the source is not obvious, you will want to get professional help right away. There are many possibilities, including wiring errors, magnetized building steel and leaking fluorescent lights that an experienced engineer can help identify and resolve. Each source has a unique solution, so shielding is not always the appropriate answer.
• Evaluate the types of equipment that are being affected. If the fields are relatively low, it may be possible to move or swap out equipment to minimize the problem. Departments or offices may be reconfigured so that less sensitive computer monitors are used in the affected space. If the long-term utility of the affected space is not your focus or if only one or two computer monitors are affected, device shielding may be the mitigation option you choose.
• Post-construction mitigation may be expensive, but can provide a permanent fix to preserve your investment and space. Increased power use, increased workplace density and increased sensitivity of equipment are all predictors that EMF problems will become more common in the years to come.